SOURCE

(function () {
    Array.prototype.insertSort = function () {
        for (let i = 1; i < this.length; i++) {
            let temp = this[i];
            let j = i;
            while (j > 0) {
                if (this[j - 1] > temp) {
                    this[j] = this[j - 1];
                } else {
                    break;
                }
                j--
            }
            this[j] = temp
        }
        return this
    };
    [3, 4, 2, 9].insertSort();
})();